1 Bats are the only mammals that can fly! They are most active at night or during the twilight of dawn and dusk. When the sun comes up, bats return to their homes, hang themselves upside down with their clawed toes, and take a long nap!2 When bats fly, they use their mouths or noses to send out high-pitched sounds. Then, bats rely on their hearing to pick up echoes of these sounds. This process is called echolocation (echo-location). Echolocation helps bats to find their way in the dark and spot prey like moths.3 Surprisingly, .....For the complete story with questions: click here for printable